DOI: 10.1016/j.quascirev.2016.09.029
Scopus记录号: 2-s2.0-84989318898
论文题名: Unraveling North-African riverine and eolian contributions to central Mediterranean sediments during Holocene sapropel S1 formation
作者: Wu J. ; Böning P. ; Pahnke K. ; Tachikawa K. ; de Lange G.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 152 起始页码: 31
结束页码: 48
语种: 英语
英文关键词: Elemental geochemistry
; Libya
; Nd isotopes
; North Africa
; Provenance
; Sapropel S1
; Sr isotopes
Scopus关键词: Climate change
; Fertilizers
; Isotopes
; Neodymium
; Sediments
; Elemental geochemistry
; Libya
; Nd isotopes
; North Africa
; Provenance
; Sapropel S1
; Sr isotopes
; Strontium
; chemical element
; deposition
; eolian process
; flux measurement
; freshwater input
; Holocene
; isotopic composition
; Mediterranean environment
; neodymium isotope
; paleoclimate
; precipitation (climatology)
; provenance
; reconstruction
; sapropel
; sediment chemistry
; sediment core
; strontium isotope
; Ionian Sea
; Libyan Arab Jamahiriya
; Mediterranean Sea
; Mediterranean Sea (East)
; Nile River
; North Africa
; Tunisian Shelf
英文摘要: Hydroclimate variability has exerted a fundamental control on the alternating deposition of organic-lean marl and organic-rich sapropel sediments in the eastern Mediterranean Sea (EMS). However, the exact mechanisms regarding the freshwater sources and related changes are still debated. Here, Sr and Nd isotopes and high-resolution elemental data are used to constrain different riverine and eolian supplies to the central Mediterranean over the past 9.8 ka. The detrital sediments in core CP10BC, taken at the margin of the Libyan shelf in the southwestern Ionian Sea, can be described by a three-endmember mixing system based on Sr and Nd isotopic compositions. The same systematics can also be deduced from Ti and K compositional variability. The endmembers comprise: Saharan Dust, Aegean/Nile, and Libyan Soil, representing the eolian supply from North Africa, the riverine inputs from the Aegean/Nile areas, as well as the riverine and shelf-derived fluxes from the Libyan-Tunisian margin, respectively. For the sapropel S1 period in particular, we find important detrital supplies from fossil river/wadi systems along the Libyan-Tunisian margin, activated by intensified African monsoon precipitation. Combining the temporal profiles with the consistent variability observed in the 87Sr/86Sr–1000/Sr diagram, such Libyan contribution has been most prominent during the uppermost period of sapropel S1 in core CP10BC. This observation is in agreement with hydroclimate reconstructions of northwestern Libya. Comparison of the Sr-Nd isotope data between core CP10BC and four cores taken along a west–east transect throughout the EMS shows that this detrital supply originated mainly from western Libya/Tunisia, and was transported as far eastward as ∼25°E while being diluted by an increasing Nile contribution. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59407
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences–Geochemistry, Faculty of Geosciences, Utrecht University, Princetonplein 9, Utrecht, CC, Netherlands; Max Planck Research Group for Marine Isotope Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Strasse 9-11, Oldenburg, Germany; CEREGE, Aix-Marseille Université, CNRS, IRD, Collège de France, CEREGE UM34, Aix en Provence, France
Recommended Citation:
Wu J.,Böning P.,Pahnke K.,et al. Unraveling North-African riverine and eolian contributions to central Mediterranean sediments during Holocene sapropel S1 formation[J]. Quaternary Science Reviews,2016-01-01,152